Fritzoc, I like this a lot, and will use it as a starting point for doing a top on my Bantam T3-C. I'll be interested to see what you use for a perimeter seal and how it turns out, too.
Wondering what entered the decision to have it open driver's side instead of passenger side? I've pondered that and can see an advantage to having it open curb side, so if I need to pull something out of the trailer while parked or on the side of the road to help someone, for example, I wouldn't be standing in traffic.
You're in KY, right? I may ask to stop by when coming down through there in the next month to see if your guy would do one for me. Design would be much the same, though a couple inches narrower for the T3-C than for an M416.
Thanks for posting the images and details.